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Background: The effect of natural disasters on secondary sex ratio SSR and perinatal outcomes has been suggested. This study aimed to examine effects of the Great East Japan Earthquake on perinatal outcomes using vital statistics of Japan. Methods: Birth registration data from vital statistics of Japan between March and March were used.
Pregnant women who experienced the earthquake were categorized according to their gestational period as of March 11, , as follows: gestational weeks , , , and group. Similarly, pregnant women who did not experience the earthquake were categorized according to their gestational period as of March 11, and used as controls group. We also categorized prefectures as "extremely affected", "moderately affected", and "slightly or unaffected" regions.
SSR, birth weight, and gestational period were compared between both groups. Results: The number of singleton births was , in the group and , in the group. In the extremely affected region, the SSR among women at weeks of gestation was significantly lower in the group compared with the group In the extremely affected region, children born to women who experienced the earthquake at weeks of gestation had significantly lower birth weights. Conclusions: The SSR declined among women who experienced the earthquake during early pregnancy, particularly in the extremely affected region.
However, no apparent negative effect of the earthquake on perinatal outcomes was observed, although birth weight of infants who were born to women who experienced the earthquake at weeks of gestation were lower. Abstract in English, Japanese. Publication types Research Support, Non-U.